Screw-making and metal-turning lathe.



I No. 808,887. PATENTED JAN. 2, 1906. .H. P. TRUEMAN 6s E. D. GLEGHORN.SCREW MAKING AND METAL TURNING LATHE.

APPLICATION FILED 111111,29, 1h02.

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SCREW MAKING AND METAL TURNING LATHE.

APPLICATION FILED Dmze, 1902.

11 SHEETS-SHEET Z.

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APPLICATION FILED DEG.29, 1902.

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lllllllllllll l No. 808,887. PATENTNNJAN. 2, 1906. H. P. TNUBMAN N E. D.OLEGHORN.' SCREW MAKING AND METAL TURNING LATHB.

APPLICATION FILED DEO.29, 1902.

11 SHEETS-SHEET 5.

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PATENTED JAN. 2, 1906.

' H. P. TRUEMAN @L E. D. CLEGHORN. SCREW MAKING AND METAL TURNINGL'ATHE.

APPLICATION FILED DBC. 29, 1902.

1l SHEETS-SHEET 6.

@WARD DOLEcf/oR/v No. 808,887. PATENTBD JAN. 2, 1906.

H. P. TRUEMAN L E. D. CLEGHORN. SCREW MAKING AND METAL TURNING LATHE.

APPLICATION FILED DEG.29,1902.

11 SHEETS-SHEET 7.

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No. 808,887. PATENTED JAN. 2, 1906. H. P. TRUEMAN & E. D. GLEGHORN.SCREW MAKING AND METAL TURNING LATI-IE.

APPLIOATION FILED DEG. 29, 1902.

11 SHBETS*SHEBT 8.

75l/E MA N D mm MW Nn. 808,887. PATBNTED JAN. 2, 1906. H. P. TRUEMA-N &E. D. CLBGHORN. SCREW MAKING AND METAL TURNING LATHE.

APPLICATION FILED DBO. 29, 1902.

11 SHEETS-SHEET 9.

wrmgssss zy m E v zum @lm #AAW- No. 808,887. PATBNTBN JAN. 2, 1906. H.P. TRUEMAN A; E. D. GLEGHORN. SCREW MAKING AND METAL TURNING LATHB.

APPLICATION FILED DEO.29, 1902.

l1 SHEETS-SHEET 10.

FMA-MAN D 0L saw/QN HENRY P E0 WA R0 No. 808,887. PATENTED JAN. 2, 1906.H. P. TRUEMAN & E. D. GLEGHORN.

SCREW MAKING AND METAL TURNING LATHE.

APPLICATION FILED DEO. 29, 1902.

i1 SHEETS-SHEET 11.

5B WITNESSES @W5 am..

'UNiTED sTATEs PATENT y OFFICE.

HENRY PATTMAN TRUEMAN AND EDWARD DUNCAN CLEGHORN, OF WORCESTER, ENGLAND.

SCREW-MAKING AND METAL-TURNING LATHE.

Specification of Letters Patent.

Patented Jan. 2, 1906.

Application filed December 29. 1902. Serial No. 136,880.3@

,To @ZZ whom, t may concern.'

Be it known that we,HENRYPATTMAN TRUE- MAN, residing at Plynlimon,Rainbow Hill, Worcester, and EDWARD DUNCAN CLEGHORN, residing at ConwayVilla, lStanley Road, Vorcester, in the county of llVorcester, England,subjects of the King of Great Britain, have invented certain new anduseful Improvements in Screw Making and Metal- Turning Lathes, of whichthe following is a specification.

' This invention relates to improvements in screw-making andmetal-turning machines, and particularly to that class of machines knownas multispindle machines, which machines are characterized by having amulti- -plicity of rods or bars under the action of the operating-toolsat one and the same time. By this means one complete piece necessitating,several distinct operations upon it is completed .proved means formoving the spindle-carrying head through a predetermined arc of movementand for securely locking the same in any desired position, an advantageof our improvement being the facility with which heavier weights can bemoved than was heretofore possible in machines of this class.

Another important object of this invention is to so construct andarrange the machine as a whole that the operator can vary the feed ofthe cutting-tools, according as they are dull or sharp, withoutrequiring to remove and re- X the gearing.

Another object of this invention is to so construct and arrange thefeed-slide cams that the operator can adjust the same cam to variousangles, thus avoiding loss of time in setting the machine for new work.VWith the same object of enabling the operator to quickly set up themachine for new work we construct the cut-off slides to swivel atvarious angles.

The feed-tubes have interchangeable reducing-sockets, and the spools ofthe feed-tubes are held in position when empty by springpressed bolts,which olfer no obstruction to the operator when filling rods of materialinto the tubes.

Another important object of this invention is to so construct thescrewing-die that end adjustment can be made readily by the operatorwhen cutting screw-threads to a definite length.

Other improvements consist in so constructing the supplementaltool-slide usual to this class of machine that it is more firmlysupported and more readily adjusted to a fresh setting and inconstructing the main tool-slide with adjusting-blocks to maintainalinement.

We also so construct the feed and clamp slides that one is carried by orupon the other, thus economizing space.

The general dis-position of the various parts is similar to existingmachines of this class, the framework of which varies according to thepurpose for which it is designed.

In order that this our invention may be more readily understood andcarried into practical etfect, reference is hereby made totheaccompanying sheets of illustrative drawings, wherein- Figure l isa'front elevational view of a screw-making and metalturning machineconstructed in accordance with this our invention. Fig. Qis aplan Viewthereof. Fig. 3 is a rear elevational view thereof. Fig. L is an endelevational view thereof looking inA the direction of the arrow, Fig. l.Fig. 5 is a similar View from the other end. Figs. 6 and 61 aresectional views, to an enlarged scale, showing the gripping portion ofthe chuck we employ. Figs. 7 and 8 are side elevational and end views,respectively, of our iiexible or eXpansible bush used in conjunctionwith a chuck, as shown in Fig. 6a. Fig. 9 is a sectional view showingthe arrangement of the reducing-sockets we employ in the manner shown inFig 6. Figs. 10 and 1l are front and end elevational views showing the ldetails of the flexible cam we employ. Fig. l2

is a sectional elevational view illustrating the means we employ forlocking the intermittently-rotating work cylinder or turret. Figs.

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13 and 13 are views serving to show the'y manner' in which we retain thefeed-tubes in their closed position when empty. Fig. la is a plan Viewshowing the construction of the clamping and feed slides used in thisIna- Fig. l5 is a sectional view of the chine.

clamp and feed slides. Fig. 16 shows a convenient means for rotating theturret. Fig. 16 illustrates the form of chain we employ in connectionwith the device illustrated by Fig. 16. Fig. 17 is an enlarged view ofthe end adjustment for the screwthreading device. Fig. 18 is an enlargedview showing angular adjustment to cut-0E slides. Fig. 18 is a plan viewthereof. Fig. 19 is an enlarged View showing the means for adjusting tocorrect wear of tool-slides. Fig. 20 is an enlarged View showing themeans for supporting and actuating the supplementary toolslides. Fig. 21shows a modified form of mechanism for intermittently moving theworkcarrying turret through a determined arc. Fig. 21 illustrates thegearing for rotating the stock-spindlesand tools, and Fig. 22 is a viewshowing the change-speed gearing we employ.

Referring to the drawings, in which like characters of referenceindicate corresponding parts wherever occurring, the framework of themachine is designated by the letters A, B, C, D, and E, A A indicatingthe lower legs; B, the pan; C C, the upper legs; D, the bed, and E thework-cylinder case or frame.

Motion is communicated to the top shaft 8 by a power-driven band appliedto a pulley 8. A spur-gear 10 drives the four gears 10 so as to rotatethe four tool-spindles 11, which 'tool-spindles are carried by thetool-head 3. At the end of the shaft 8 remote from the pulley 8 a gear 7is fixed, which gear drives four wheels 9, which four wheels 9 are keyedupon the four work-spindles 2, so that the tool-spindles 11 and thework-spindles 2, carried by the turret 1, can be revolved from the shaft8. The lower shaft 28 carries camdrums and cams for operating variousparts of the machine, as will hereinafter appear. Motion is indirectlyapplied from the pulley 8 to the shaft 65 by means of a driving-beltpassing around a step-pulley upon a supplemental shaft and a seconddriving-belt passing fro'm the pulley on the supplemental shaft to thestep-pulley 66 on said shaft 65. The motion thus transmitted from theshaft 8 to the shaft 65 is communicated to the shaft 34l by means of thegear 68, which derives its motion from the pinion 67, carried upon theshaft 65 and keyed thereon in such a way that it must rotate at the samerate as the shaft, but is capable of being moved longitudinally alongthe shaft upon the lever 69, the said lever 69 being located upon theshaft 65 and capable of sliding thereon, so that the gear 68 upon saidlever 69 may be brought into mesh with any one of the gear-wheels 63upon the shaft 34 in order that said shaft 34 may be rotated at anydesired speed. The forward end of the lever 69 is provided with aspring-catch 70, which is adapted to engage with holes or notches formedin the gear-case cover. The gear-wheels 63 can be engagedand motioncommunicated to the shaft 34. Bevel-gears 36 and 40 on the shaft 34engage with the bevel-wheel 37, which is fixed to the shaft 41. Thelatter, carrying a worm 41, engages the worm-wheel 20, which, beingfixed on the shaft 28, gives motion to the same. The cam-strips 14 onthe drum 15, keyed upon the shaft 28, engage with the roller 13, fixedupon the feed-slide 12, and move the said feedslide 12, and the cam-strip 18 on the said drum 15 engages with the roller 17, fixed upon theclamp-slide 16, and moves the said clamp-slide 16. The cam-strip 5 onthe drum 6, keyed upon the shaft 28, engages with the roller 4, fixedupon the tool-slide 3, and moves the said tool-slide 3 toward thework-spindles 2, the tool-slide 3 being returned by another cam-strip 6on the drum 6.

The tool-carrying head 3 is retracted at an accelerated speed, and theturret 1 is revolved during this acceleration by the shaft 34 revolvingat a determined speed, the clutch 35 upon the shaft 34 being engagedwith the pinion 36, which pinion 36 engages with the outer circle ofteeth on the bevel-wheel 37. At a given point, determined by the cam 38,fixed upon the shaft 28, the clutch 35 is moved by the bell-crank lever39, so that the said clutch 35 engages the pinion 40, which now drivesthe bevel-wheel 37 by means of the inner circle of teeth, consequentlyincreasing the speed of rotation of the bevel-wheel 37, and consequentlythe worm-shaft 41, upon which the bevel-wheel 37 is keyed.

The worm-shaft 41 drives the worm-wheel 2O and also the chain-wheel 23,keyed upon the end of the worm-shaft 41, at an accelerated speed, (thusaccelerating the rotation of the turret 1,) the rotation of the shaft 34remaining at the predetermined constant speed. The chain-wheel 23aforesaid will, it is obvious, be revolved continuously, and the chain24 is provided at intervals with projections 24. The chain-wheel 25revolves loosely upon the worm-shaft 26, and on each side of the saidchain-wheel 25 is fixed a toothed wheel 43 and 43, For convenience ofillustration the wheel 43 and the projections 24 on the chain 24, whichare clearly shown in Figs. 16 and 16, are not shown in Fig. 3. Thesetoothed wheels 43 and 43 are adapted to engage with the projecting teeth24 of the chain 24. It will now be understood that the said chain 24will revolve the loose chain-wheel 25 without rotating the Worm-shaft26. When, however, the projecting teeth 24 on the chain 24 arrive at thetoothed wheels 43 and 43, the teeth will engage with the said toothedwheels 43 and 43, and thus drive the worm-shaft 26, upon which saidtoothed wheels are keyed. It will be understood that the worm-shaft26,meshing with the worm-wheel 30 of the turret 1, drives the said turret.The number of projecting teeth 24 is directly proportional to the numberof revolutions required to be made IOO IIS

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' 25 is connected to the worm-shaft 26, which shaft is under torsionbefore the cam 27, Fig. 12, on the shaft 28 allows the lock-bolt 29 tobe withdrawn from engagement with the turret 1. When the bolt 29 iswithdrawn from engagement with the turret 1, the wornn on the worm-shaft26, Fig. 3, operates in conjunction with the worm-wheel 30, fixed to theturret, moving the said turret on `its axis.

, When the said turret has accomplished nearly one-fourth of arevolution, the cam 27 on shaft 28 presses the lock-bolt 29 into contactwith the turret 1. The spring 31 allows the taper end 32 of thelock-bolt 29 to remain in contact with the surface of the turret 1.When, however, the bushed cavity or socket 33 in the turret comesopposite the taper end 32 of the lock-bolt 29, the spring 31 causes thebolt to enter the said hushed cavity, and thus arrest the furtherrotation of the turret. At this moment the cam-plate 19 on wormlwheel 20allows the spring-controlled lever 21 to move the clutch 22 out ofengagement with the chain-wheel 23, and the spring21a, bearing againstthe leverv 21, acts to move said lever in order to throw the clutch 22out of engagement.

The form o f ieXible adjustable cam we employ for operating the tool andfeed slides isA particularly illustrated in Figs. l0 and 11. The cam isformed by fixing metal strips 5 and 6, preferablyof circular section,around the surface of a cam-drum 6. Both vends of the cam-strips 5 .and6EL are preferably hooked and adapted to engage with screws 72, carriedby sliding blocks 73, which blocks can be moved longitudinally in slots74, formed in the cam-drum 6. The screws 72 enable the cam-strips to beput in tension after setting' to any desired angle. After setting thecamstrip to any desired lead we provide a series of supporting-blocks75, arranged to slide in the slots 74 and capable of being clamped inposition, so that the said blocks can be tXed in contact with the exiblestrips 5 and 6", and thus reinforce and strengthen the cam to resist thepressure of the rollers 4, 13, and 17 Fig. 3, which operate inconjunction with the said flexible adjustable cam-strips.

The cutting-off slide which we employ in' connection with this ourinvention is illustrated particularly by Fig. 18. Theangularly-adjustable cutting-off slideways 77 are carried upon the mainframe or bed 76 by a clamping-bolt 7.8 and carry cutting-off tools.

The circular neck 79 of the bolt 78 lits in a recess in the bed 76 andpermits of the slideways 77 being set at varying angles and also atright angles to the work-spindles 2. In order that this adjustment maybe eected, the levers 80, which operate the slideways when theythemselves are operated by the cams 28, carried by the shaft 28, areprovided with balljoints 80, havingtelescopic necks. The saidball-joints 80a are retained by grooved plates 80b,attached to thetool-slides 77a. These devices enable the slides 77 to move at an anglediffering from the right-angle plane of movement which is constant withregard to the levers 80.

In order to enable various thicknesses of work to be operated upon, weemploy the reducing-socket 54, so called on account-of its taperedformation. (Illustrated by Figs. 6*L and 9.) As will be seen, one end ofthe reducing-socket 54 is provided with a screwthread on its outerperiphery, thus enabling it to be screwed into the feed-tube 54, locatedwithin the hollow work-spindle, while the other end is screw-threadedinteriorly, so as to adapt it to receive the screwed end of thefeed-shell 54d. The spring-chuck 53 is carried byv the reducing-socket54, and the exible bushing 53l of such chuck is arranged to grip thework. y

In order to retain the feed-spools in their closed position when empty,we preferably employ spring-actuated balls 82, which are adapted toengage in a groove 83. formed on the outer end of Nthe spool 81aforesaid for that purpose.

In Figs. 2 and 3 one spool is shown in its forward position and theother in its retracted position, close to the work-spindle. The balls 82in the end of the work-spindle act as springactuated pawls and snap intothe grooves 83 in the periphery of the spool and hold the spool fromslipping endwise until forcibly operated upon by the bowl or projectionon the feedslide, which projection engages the {ianged end 81 of thefeed-spool.

Referring particularly to Fig. 17, the drawings illustrate the deviceswe employ in constructing a screw-threading device according to thisinvention. For convenience of illustration the section has been arrangedto pass through the centers of both of the overlapping pegs 57 and 58.AThe screwing-die 55 or tap is secured to the special tool-holder 55.This tool-holder is or may be revolved in the same direction as the workrotated by the spindle rotated by the gear-wheels 10 and 10a.

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' be completed.

the rear end of the tool-holder 55 is {ixed a ratchet-wheel 59, adaptedto engage with a pawl 59, fixed on the bracket 60. A spring 61 isplaced, as shown, upon the tool-holder 55. The operation of the parts isas follows: The tool-carryinghead 3 advances toward the work carried byspindle 2. When the die 55a comes in contact with the work, the peg 57engages with the peg 58. The die 55u is now driven at the same rate asthe sleeve, which rate of rotation being greater than the workspindle 2causes the die to screw itself upon the work. If the tendency of the dieis to screw upon the work with a greater longitudinal movement than theforward movement of the head 3, the pegs 57 and 58 lose contact witheach other and the die ceases to screw upon the work. When the head 3continues its advance, the pegs 57 and 58 again engage and the diescrews upon the work. Vhen the head 3 reaches the end of its travelforward, the screwed portion of the work will Upon the return of thehead 3 the pegs 57 and 58 are drawn apart from each other and the dierevolves with the work. When the ratchet-wheel 59 upon the end of thedie-tool holder 55 engages with the pawl 59, lixed upon the bracket 60,the pegs 57 and 58, carried by the die-tool holder 55 and the sleeve 56,respectively, are separated, and the tool-holder 55 and die 55u areprevented from revolving, and the work-spindle by its continuedrevolution runs the die off the work. The exact length of screw to beformed upon the work is secured by moving the sleeve 56 longitudinallyin relation to the bracket 60, fixed on the tool-head 3. A fine-threadscrewnut 62, screwed in the bracket 60 and gartered to' the sleeve-56 bythe collar 62, enables fine adjustment to be made, coarse adjustmentsbeing obtained by moving the bracket 60 upon the base of tool-head 3.

A combination feed-change and disengaging gear constructed according tothis our invention consists of the following devices, (shown clearly inFigs. 1 and 2:) [n connection with the turret 1 we provide asupplemental tool-carrying slide 44, Figs. 1 and 5. This said tool-slide44 is carried by an arm 45 and is provided with the usual clamps forholding the tool. The arm 45 is preferably lixed upon the turret-case 1,and the toolcarrying head 3 has rigidly attached to it a sleeve orbearing 46, adapted to slide upon an extension of the arm 45. Thetool-slide 44 is operated in a vertical plane to and from the workcarried by the work-spindle by the following devices: The arm 45 carriesthe base portion of slide 44. An extension 44a of the tool-slide 44carries a worm-wheel 47. (Shown clearly in Fig. 20.) rThis worm-wheelactuates a crank-disk 48, having a crank-pin 49 working in a slot formedin tool-slide 44. A worm-shaft 50 passes through bearings and is held inengagement with the teeth of the worm-wheel 47. The outer end of thewormshaft 50 passes through a bearing 51, carried on the sleeve 46. Oneach side of the bearing 51 the worm-shaft 50 carries pinch blocks ornuts 52 and 52. (See particularly Fig. 3.)

The tool-slide 44 can now be moved by turning the worm-shaft 50 on itsaxis, and this device is used for purposes of adjustment. The tool-slide44 is automatically operated by moving the worm-shaft longitudinally.This end movement is caused by the bearing 51, carried on the tool-slide3, engaging with the nuts 52 52a, in which case the worm-shaft acts as arack to move the wormwheel 47. If the tool-slide 44 is required to bepressed forward against the material to be operated upon, springs 541J54nl are interposed between the bearings 51 and the nuts 52 52", and itwill be seen that the springs allow of continued longitudinal movementof the bearing 51 after the tool carried by the slide 44 has come incontact with the work.

In Fig. 19 we have shown how we propose to provide for adjustmenttocompensate for wear and tear of the tool-slide 3. Adjustingstrips 84,adjusting-screws 85, and clampbolts 86 are provided. These devicespermit of lateral adjustment for the tool-slide 3. Vertical adjustmentis provided for by means of the blocks 87, fitted into slots on theunder side of the slide 3. By means of the adjusting-screws 88 verticaladjustment of the toolslide is secured. If lateral adjustment isrequired, the clamp-bolts 86 are withdrawn and the position of thefitting-strip 84 is adjusted by means of the screw 85, when theclampbolts 86 are again replaced. If, however, the bottom of thetool-slide 3 becomes worn and it is desired to adjust vertically, thestrip 84 is removed and the fitting-strip 87 adjusted by means of thescrew 88.

The feed and clamp slides constructed according to this our inventionlare shown distinctly by Figs. 14 and 15. The feed-slide 92, whichoperates in the usual manner to push the material endwise through thechuck 53, is carried by bars or rods 94 and 94, these rods being fixedto or carried by the clampslide 93. The clamp-slide.l whose function isto operate the usual jaw-levers which clamp the material and hold itwhile it is being op erated upon by the tools, is operated by a roller17 engaging with cam 18 on a drum, such as 15, as before described. Thefeedslide is also operated by its own roller 13, which engages 4with asimilar cam 14 on the drum 15.

Referring particularly to Figs. 6, 7, and 8, 53 designates the grippingportion of the spring-chuck commonly used in machines of this kind.According to our invention the gripping portion of the chuck 53 isprovided with a recess or cavity 53, which said cavity is adapted toreceive the bushing illustrated by Figs. 7 and 8, such bushing beingslit in IOO IIO

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ithread at its inner end, and a reducing-socket having one endscrew-threaded internally and adapted to receive the externallyscrewthreaded end of the feed-shell and having its other end screwthreaded externally and adapted to screw into the feed-tube,substantially as specified.

2. In screw making and metalturning .lathes, in which a supplementaltool-carrier is employed; means for imparting a sliding movement to saidtool-carrier, said means comprising a shaft having a worm-wheel andcrank for actuating said tool-carrier, a wormshaft to actuate saidworm-wheel; a bearingbracket upon the main tool-slide for supportingsaid shaft; an arm for supporting said tool-carrier, and an extension onsaid arm, the bearing-bracket for the worm-shaft having an opening orguide through which said extension slides; in combination with stops andsprings for automatically operating said toolcarrier, said stops beingrigidly carried upon said worm-shaft, one on eachl side of saidbearing-bracket, and said springs being interposed between -said stopsand said bearingbracket, substantially as specified.

3. In screw making and metalturning lathes, the cutting-olf slidewaysheld upon the main frame and capable of angular adjustment; theactuating-lever of said cutting-olf slideways; the telescopingball-joints of said actuating-lever; and the grooved guides along whichthe ball-joints of said actuating-lever operate, said grooved guidesbeing attached tothe tool-slides, substantially as specified.

4. In stock-feeding mechanism for screwmaking and metal-turning lathesthe combination with the feed-slides and the feed-spools operated bysaid feed-slides; of means for retaining said feed-spools in theirretracted positions, said means consisting of balls arranged to lie in agroove in the feed-spool; recesses in the end of the feed-tube, in whichare located said balls; and springs located in said recesses andarranged to exert a pressure on said balls, substantially as specified.

5. In screw-making and metal-turning lathes of the inultispindle type,means for enabling the tool-slides to be adjusted to compensate forwear, said means comprising the combination with side strips, capable ofadjustment to compensate for the wear on the sides of the tool-slide; ofscrew and clamp bolts for adjustment; and blocks litted in spaces; andthe spaces formed in the under side of the tool-slide, said blocks beingcapable of vertical adjustment to compensate for wear on the bottom ofthe tool-slide; and the l set-screws for adjusting vertically,substantially as specied.

6. In screw-making and' metal-turning lathes, means for operating thefeed-spools, said means comprising a clamp-slide; a feedslide arrangedto slide upon said clamp-slide; a cam-pin upon said clamp-slide and acampin upon said feed-slide, said pins being arranged to be operated bycam-strips upon a cam-drum; and the said cam-drum and the saidcam-strips upon said cam-drum, substantially as specified.

HENRY PATTMAN TRUEMN. EDWARD DUNCAN CLEGHORN. Witnesses:

PERCY LAMB, HENRY W. JEYNES.

